Downloading YouTube thumbnails for private use is mostly acceptable. On the other hand, be aware that thumbnails are copyrighted information, and making use of them commercially without the need of permission may possibly infringe on copyright laws. Sure, you could download thumbnails from YouTube Shorts or Reside streams working with https://save-youtube-thumbnail66259.madmouseblog.com/19044023/detailed-notes-on-youtube-thumbnail-grabber